N',N'-dialkylhydrazides of para-tert-butylbenzoic acid as extractants for copper(II) recovery from ammonium media

Abstract

The extraction of copper(II) with N',N'-dialkylhydrazides of para-tert-butylbenzoic acid has been investigated. These reagents have good solubility in hydrocarbonic solutions. Their distribution coefficient between organic and aqueous phases equals the distribution coefficient of oxyoxime class which are copper(II) industrial extractants. These reagents have been established to recover copper(II) effectively in a large range of pH and NH3 concentration values. The composition and structure of copper complex has been identified. They recover copper(II) selectively from accompanying elements. Copper(II) reextraction from organic phase carries out easily with dilute acids. These compounds do not transfer NH3 from the aqueous phase to the organic phase and surpass a commercial extractant of β-dicetone class Lix 54 in copper(II) recovery efficiency.